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        <p>之前提交到某平台的漏洞，现在已经修复</p>
<h1 id="漏洞证明"><a href="#漏洞证明" class="headerlink" title="漏洞证明"></a>漏洞证明</h1><ol>
<li>前提条件<br>用户可以发帖</li>
<li>复现步骤<br>发表帖子后,访问如下链接：<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">forum.php?mod=ajax&amp;action=setthreadcover&amp;inajax=1&amp;fid=2&amp;wysiwyg=1&amp;imgurl=ftp://127.0.0.1:8089&amp;tid=26815&amp;pid=1</span><br></pre></td></tr></table></figure>
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<p>其中的imgurl是ssrf探测的地址,另外需要将tid修改为自己发表的帖子的tid值.这个值在chrome浏览器前端中搜索tid可以找到.</p>
<p><img src="/blog/img/6.png" alt=""></p>
<h1 id="漏洞分析"><a href="#漏洞分析" class="headerlink" title="漏洞分析"></a>漏洞分析</h1><p>漏洞触发的代码在source/module/forum/forum_ajax.phpforum_ajax.php文件大约211行处,调用了setthreadcover函数.</p>
<p>函数会根据第五个参数imgurl发起网络请求,此处imgurl刚好可控.<br><img src="/blog/img/7.png" alt=""></p>
<p>最终在source/class/class_image.php的init函数中发起请求<br><img src="/blog/img/8.png" alt=""></p>
<h1 id="挖这个洞的思路"><a href="#挖这个洞的思路" class="headerlink" title="挖这个洞的思路"></a>挖这个洞的思路</h1><ol>
<li>思路比较简单，在这个source/class/class_image.php中看到init函数发起网络请求,向上找调用init函数的地方挖掘漏洞.</li>
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